generate barcode c# Win32 Applications in Visual Studio .NET

Creation Quick Response Code in Visual Studio .NET Win32 Applications

Win32 Applications
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Figure 15-24 The subclassing demo contains a form that you can drag by clicking anywhere on the client area.
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Sometimes the data passed together with a message is a structure pointed to by the LParam value. In this case, you can use the GetLParam method to read values in that structure. For example, when the user starts a resize operation on the form, Windows sends a WM_GETMINMAXINFO message whose LParam value points to a MINMAX INFO structure, defined as follows:
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Structure POINTAPI Dim X As Integer Dim Y As Integer End Structure Structure MINMAXINFO Dim ptReserved As POINTAPI Dim ptMaxSize As POINTAPI Dim ptMaxPosition As POINTAPI Dim ptMinTrackSize As POINTAPI Dim ptMaxTrackSize As POINTAPI End Structure
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The ptMinTrackSize and ptMaxTrackSize elements define the smallest and largest size that the form can assume. For example, on a 1024-by-768 pixels screen, a form usually can be resized up to 1032 by 776 pixels. (See Figure 15-24.) Here s the code in the demo application that reads this information:
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Case WM_GETMINMAXINFO Dim mmi As MINMAXINFO = CType(m.GetLParam(mmi.GetType), MINMAXINFO) lblStatus.Text = String.Format( Max size = ({0}, {1})", _ mmi.ptMaxSize.X, mmi.ptMaxSize.Y)
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Unfortunately, you can t modify the values in a memory block pointed to by LParam by using a method in the Message object. However, you can do that by calling the Win dows API CopyMemory function:
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15:
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Get the size of the MINMAXINFO structure in bytes.
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Dim length As Integer = System.Runtime.InteropServices.Marshal.SizeOf(mmi)
Change the minimum size of the form in a resize operation.
mmi.ptMinTrackSize.X = 600
mmi.ptMinTrackSize.Y = 300
CopyMemory(m.LParam, mmi, length)
This code works if you declare the API CopyMemory function in such a way that it can take a MINMAXINFO structure as the destination of the copy operation:
Declare Sub CopyMemory Lib kernel32 Alias RtlMoveMemory _ (ByVal dest As IntPtr, ByRef mmi As MINMAXINFO, ByVal bytes As Integer)
Visual Effects
The Form object exposes a pair of properties that can add some graphical pizzazz to your applications with minimum effort. Additionally, the Application.EnableVisualStyles method lets you leverage the new Windows XP visual styles with just one line of code.
The TransparencyKey Property
If you assign a color value to the TransparencyKey property, all the pixels of that color are considered transparent and won t be drawn. If the user clicks on one such point, the underlying window is activated instead. You can create oddly shaped forms by sim ply painting the area that doesn t belong to the form with the color that you assign to the TransparencyKey property. You get the best effect if you work with a form whose FormBorderStyle is set to None so that you don t have to worry about the title bar. Then you have to select a color to be used as a transparent color, and of course you must be sure that no graphic element in the form contains any pixel of this color. If the form has a regular shape, such as the elliptical form in Figure 15-25, you can draw such pixels using graphic methods of the Graphics object passed to the Paint event. For example, this is the code the demo application uses to create an elliptical form:
Private Sub TransparentForm_Paint(ByVal sender As Object, _ ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint Make blue the transparent color so that only the ellipse is visible.
Me.TransparencyKey = Color.Blue
Create a brush of the same color as the form s background color.
Dim b As New SolidBrush(Me.BackColor)
Draw a blue rectangle over the entire form.
e.Graphics.FillRectangle(Brushes.Blue, Me.ClientRectangle)
Draw a filled ellipse of the original background color.
e.Graphics.FillEllipse(b, Me.ClientRectangle)
Create a black border for the ellipse.
e.Graphics.DrawEllipse(Pens.Black, Me.ClientRectangle)
Destroy the brush.
b.Dispose()
End Sub
Part IV:
Win32 Applications
Figure 15-25 An elliptical form
Even if you aren t familiar yet with the graphical possibilities of GDI+, the sense of the preceding code should be clear. If the shape of your form can t be created easily with graphic methods, you might create a bitmap with any graphic application, including Microsoft Paint, and load the image into the form s BackgroundImage property. If the form is resizeable, you should use a DrawImage method to resize the bitmap so that it always covers the entire form s surface. Regardless of how you define the form s shape, remember that you should provide end users with the ability to move and close the form. The form in the demo application uses the subclassing technique described earlier to let the user move the form by click ing anywhere on its client area.
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